US5626941A - Thin film media for very low flying height/contact recording application - Google Patents
Thin film media for very low flying height/contact recording application Download PDFInfo
- Publication number
- US5626941A US5626941A US07/889,157 US88915792A US5626941A US 5626941 A US5626941 A US 5626941A US 88915792 A US88915792 A US 88915792A US 5626941 A US5626941 A US 5626941A
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- US
- United States
- Prior art keywords
- depressions
- thin film
- predetermined pattern
- major surface
- media
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/90—Magnetic feature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
Definitions
- This invention relates generally to the field of magnetic disk devices.
- the trend in magnetic disk devices is to store more data in less space.
- high density magnetic recording media devices are obtained by reducing the flying height of a read/write head with respect to the media surface.
- CSS Contact start stop
- Stiction develops at the interface of the read/write head and the surface of the magnetic disk. Stiction is the combination of friction and "stickiness" at the magnetic media surface that causes the read/write head to adhere to the surface, making it harder for the head to initiate movement therefrom. Typically, stiction occurs when the magnetic media surface is too smooth. To overcome stiction, a large force needs to be applied to the read/write head to initiate movement from the surface. Stiction can become high enough to cause damage to the head, the media, and the head suspension, which cause the head to crash into the magnetic media.
- CSS recording media Another problem associated with the CSS recording media is that its surface is very smooth. Although a smooth media surface permits the read/write head to fly closer to the media surface, it is not very durable because the amount of lubricant that can be retained is very little.
- One way of preventing stiction and increasing the durability of the media surface is to mechanically texture or rough the disk with lubricated peaks and valleys.
- the read/write head can rest on the peaks during starting and stopping, thereby reducing the contact area between the head and media. By resting on the peaks, the amount of force necessary to initiate movement of the read/write head is considerably less.
- the mechanically textured peaks and valleys are formed by pressing an abrasive (i.e., emery tape) against a rotating media. While this process has been used to prevent stiction, it does have serious drawbacks. One major problem is that this process cannot be controlled. Thus, there is a tendency for the mechanically textured peaks and valleys to be nonuniformly distributed and to have poor texture quality in terms of depth, width, and height. Another drawback is that nonuniform peaks are highly stressed and brittle. This increases the probability that a low flying read/write head will interact or collide with the peaks. The interaction causes wear on the media and debris to deposit on the read/write head.
- the present invention provides a rigid thin film media for a very low flying read/write head that satisfies the aforementioned needs.
- a uniform pattern of depressions having uniform depth and width are formed on an upper surface of a rigid media substrate. Between the depressions are strain free planar plateaus of uniform height. The spacing between the series of depressions and the planar plateaus is uniform.
- a magnetic film layer, an overcoat layer and a lubricant layer are formed over the patterned media substrate, respectively.
- the vertical uniformity of the pattern results in a rigid thin film media having substantially improved tribological properties (i.e. reduced wear, stiction and debris), durability and electrical performance compared to the mechanically textured media.
- the pattern may have a variety of shapes.
- the pattern may have a fish net shape, or a nested chevron shape, or a concentric circle shape or a circumferential hole shape or a series of dots arranged in concentric circles.
- Each pattern has dimensions (i.e., pitch, width and depth) that are uniform with respect to each other.
- the patterned depressions with plateaus therebetween form a substantially planar surface which improves electrical performance by permitting a read/write head to fly at a reduced distance from the surface, thus increasing its capacity for high density recording.
- a read/write head can fly at heights less than three micro inches away from the surface with reliability.
- the patterns increase the durability of the media substrate by providing reduced contact area between the read/write head and the media, and increases the lubricant reservoir on the surface of the media. The more lubricant that the media substrate can hold the more durable it will be.
- the lubricant is entrapped in the patterned depressions and is prevented from spinning off as the disc is rotated.
- the patterns have a geometry that is suitable for servo-control applications.
- Each of the patterns generate a frequency modulation signal as the read/write head passes over a particular data track and sector.
- the frequency modulation signals are detected by a sensor (i.e., a capacitance or an optical sensor) incorporated on the read/write head and are used to maintain the head in between the data tracks. For example, a read/write head travelling over two data tracks, detects each frequency modulation signal generated from the respective data tracks. If the head is not centered in between the data tracks, a differential frequency modulation signal is produced.
- a differential frequency modulation signal causes a servo motor to drive the read/write head towards the center of the data tracks. The read/write is moved towards the center of the tracks until there is no further differential frequency modulation signal being produced.
- the patterns are preferably formed on the substrate by lithographic techniques. First, a photoresist is formed on a planar surface of the substrate. Then, a mask is placed over the photoresist and exposed to light. The exposed areas of the photoresist are washed away with a solvent. Then the exposed surface of the substrate is etched using a liquid etchant or a plasma to form a pattern of etched depressions in the planar surface. The remaining unexposed photoresist is dissolved, and the pattern substrate is cleaned thoroughly. A magnetic film and an overcoat are then sputtered over the patterned substrate. Then a liquid lubricant is deposited on top of the hard overcoat.
- a process for fabricating the thin film media onto the rigid substrate First, a desired pattern is textured onto the substrate. Then a series of uniformly strain-free depressions having uniform depth are formed on an upper surface of the rigid substrate. Next, a magnetic film is deposited over the patterned depressions and the substrate. Then an overcoat and a lubricant are applied over the magnetic film, respectively.
- FIG. 1 shows a cross-sectional view of a mechanically textured media of the prior art.
- FIG. 2 shows a cross-sectional view of a lithographically textured media of the present invention.
- FIGS. 3a through 3d show a variety of patterns contemplated in the present invention.
- FIGS. 4 through 4A show an exploded top view of a pattern embodied on a disc.
- FIG. 5 shows a top view of a pattern embodied in the lithographically textured media with frequency modulation signals being generated therefrom.
- FIGS. 6a through 6e illustrate a method of fabricating the thin film media of the present invention.
- FIG. 1 shows a cross-sectional view of a mechanically textured media 10 found in the prior art.
- the mechanically textured media 10 includes a substrate 12 with a plurality of peaks 14 and valleys 16 formed thereon. The peaks and valleys are distributed nonuniformly throughout the substrate and are of non-uniform vertical dimension.
- a magnetic film 18 is formed on the patterned substrate.
- an overcoat 20 is formed on the magnetic film and then a lubricant 22 is applied to the overcoat.
- the peaks 14 are mechanically made, they are highly stressed and therefore weak and brittle. Because of the non-uniform height, a low flying head has a high probability of interacting with the peaks. Eventually, over time the read/write head crashes or accelerates wear on the contact recording media.
- the textured media 24 is formed of a substrate 26, in which a plurality of depressions 28 of uniform depth D and uniform width W are formed to provide a texture in a planar surface of the substrate.
- the depressions are separated by uniform spacings S therebetween. Left between the depressions are planar plateaus P that are of uniform height above each depression and are strain-free.
- a magnetic film 30 is formed over the textured substrate 26, an overcoat 32 is formed on the magnetic film and a lubricant 34 is formed over the overcoat.
- the depressions 28 are uniformly distributed throughout the substrate.
- the depressions are spaced apart from each other at a distance S, which is about 2 microns to about 3 microns; the width W of each depression ranges from about 1 micron to about 2 microns; and the depth D of each depression ranges from about 0.01 micron to about 0.1 micron.
- the depressions are formed in patterns as shown in FIGS. 3a through 3d.
- the patterns may have a variety of shapes.
- FIG. 3a shows a fish net pattern 36
- FIG. 3b shows a concentric circle pattern 38
- FIG. 3c shows a herringbone or nested chevron pattern 40
- FIG. 3d shows a concentric hole or trench pattern 42.
- the above textured patterns are uniform in width, pitch and depth.
- the width of each pattern ranges from less than 1 micron to about 2 microns
- the pitch ranges from less than 2 microns to about 4 microns
- the depth ranges from about 0.01 microns to about 0.10 microns.
- FIGS. 4 through 4A show an exploded top view of a fish net pattern 36 imposed onto a section of a media disc 44.
- the fish net pattern is placed on every section of the disc. Note that the fish net pattern is placed radially on the media directed towards the center of the disc. A radially placed pattern optimizes the electrical performance of the present invention, as discussed below.
- the textured patterns of the uniformly distributed depressions result in a rigid thin film media having substantially improved tribological properties such as reduced wear, stiction, and debris generation. These characteristics provide a rigid thin film media that has greater durability than the randomly textured media shown in FIG. 1, because the non-uniform brittle peaks and valleys have been replaced with a series of uniformly distributed depressions with strain-free planar plateau surfaces therebetween.
- the textured pattern improves the electrical performance of the read/write head, by permitting it to fly at a reduced distance from the surface of the magnetic thin film media.
- the capacity of the rigid thin film media 24 to record more data is maximized.
- a read/write head for the present invention can fly at separation distances less than three micro inches away from the surface of the thin film media. The preferred distance for the present invention is about two micro inches.
- FIG. 5 shows a top view of a fish net pattern textured to the media in between two data tracks, track 1 and track 2.
- a read/write head is carried by a slider which is mounted to an actuator and a servo motor. The read/write head moves radially over the rigid thin film media so that any track on the media can be selected for use upon command.
- track 1 and track 2 each generate a frequency modulation signal 46 and 48 every time a read/write head travels over that particular area.
- Each of the frequency modulation signals 46 and 48 are detected by a capacitance or an optical sensor incorporated on the read/write head. If the read/write head is off center with regard to the two data tracks, a differential frequency modulation signal is generated by the sensor. The sensor sends the differential frequency modulation signals to the servo motor which drives the read/write head towards the center of tracks 1 and 2. The read/write head moves towards the center of the tracks until there is no further differential frequency modulation signal being produced. Thus, the read/write head can be maintained in between the data tracks.
- the lithographically textured media 24 is formed in the manner illustrated in FIGS. 6a through 6e.
- the specific processing conditions and dimensions serve to illustrate the present method but can be varied depending upon the materials used and the desired application and device geometry.
- a hard polishable substrate 26 which may comprise glass, quartz, silicon carbide (i.e., a compound of silicon and carbon), alumina (i.e., an oxide of aluminum), or other suitable ceramic material is spray or spin coated with a photoresist 50 (see FIG. 6a).
- the photoresist and substrate are baked at a predetermined temperature usually between 90° C. to 100° C. to fix the resist.
- a mask 52 having the desired pattern is disposed over the photoresist and the resist is exposed to light L (see FIG.
- the exposed areas photoresist are then washed away with a suitable solvent, such as a photoresist developer (i.e., a buffered KOH) (see FIG. 6c).
- a suitable solvent such as a photoresist developer (i.e., a buffered KOH)
- the patterns formed by the mask i.e., fish net, nested chevrons, concentric circles, circumferential holes
- the patterns formed by the mask i.e., fish net, nested chevrons, concentric circles, circumferential holes
- CF 4 /Argon plasma etch
- suitable liquid etchants i.e., hydrofluoric acid
- the magnetic film is preferably a mixture of alloys selected from the group comprising Cobalt, Chromium, Platinum, and Tantalum.
- an overcoat layer 32 usually carbon is sputtered over the film (see FIG. 6e).
- the overcoat layer could also be formed of a mixture of carbon and hydrogen or carbon and nitrogen.
- Both the magnetic thin film 30 and overcoat layer 32 are preferably sputtered onto the substrate using conventional sputtering techniques.
- a liquid lubricant 34 is applied over the overcoat layer 32.
- the thin film media is burnished to remove any bumps resulting from the sputtering techniques.
- the resulting structure is a thin film media having a rigid substrate patterned with strain-free depressions of uniform depth.
Abstract
Description
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US07/889,157 US5626941A (en) | 1992-05-27 | 1992-05-27 | Thin film media for very low flying height/contact recording application |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/889,157 US5626941A (en) | 1992-05-27 | 1992-05-27 | Thin film media for very low flying height/contact recording application |
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US5626941A true US5626941A (en) | 1997-05-06 |
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US07/889,157 Expired - Lifetime US5626941A (en) | 1992-05-27 | 1992-05-27 | Thin film media for very low flying height/contact recording application |
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Cited By (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5768075A (en) * | 1991-12-17 | 1998-06-16 | Baradun R&D Ltd. | Disk medium w/magnetically filled features aligned in rows and columns |
US5853959A (en) * | 1996-08-09 | 1998-12-29 | Seagate Technology, Inc. | Method of fabricating a contoured slider surface feature with a single mask |
US5912791A (en) * | 1997-03-14 | 1999-06-15 | Seagate Technology, Inc. | Landing zone design for a magnetic disc |
US6160683A (en) * | 1997-08-15 | 2000-12-12 | Seagate Technology Llc | Slider for disc storage system |
US6174597B1 (en) * | 1996-07-26 | 2001-01-16 | Kabushiki Kaisha Toshiba | Magnetic recording apparatus |
US6180208B1 (en) * | 1997-01-31 | 2001-01-30 | Canon Kabushiki Kaisha | Information recording medium and method for producing the same |
US6183892B1 (en) * | 1997-09-19 | 2001-02-06 | Mitsubishi Chemical Corporation | Magnetic recording medium substrate and magnetic recording medium |
US6187413B1 (en) * | 1997-12-05 | 2001-02-13 | Seagate Technology, Llc | Media landing zone with recess for texturing features |
US6212042B1 (en) | 1997-06-27 | 2001-04-03 | Seagate Technology Llc | Slider having air bearing surface which includes pads for disk storage system |
US6335080B1 (en) * | 1999-01-04 | 2002-01-01 | Seagate Technology Llc | Magnetic disk media and disk drives utilizing polymeric disk substrates |
US6350506B2 (en) | 1996-09-17 | 2002-02-26 | Corning Incorporated | Textured surface and method |
US6459547B1 (en) | 1998-12-09 | 2002-10-01 | Seagate Technology Llc | Slider with pads and textured landing zone for disc storage system |
US6487043B1 (en) | 1997-12-04 | 2002-11-26 | Seagate Technology Llc | Cross texture head disc interface |
US6495240B1 (en) * | 1999-02-10 | 2002-12-17 | Tdk Corporation | Patterned magnetic recording medium possessing recording portions with a lower height than the surrounding non-magnetic matrix |
US6510015B2 (en) | 1999-12-10 | 2003-01-21 | Seagate Technology Llc | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same |
US6529347B2 (en) | 2000-10-13 | 2003-03-04 | Seagate Technology Llc | Disc drive slider having textured pads |
US6535352B2 (en) | 1997-12-15 | 2003-03-18 | Seagate Technology Llc | Head media interface for stiction control |
US6536265B1 (en) | 1999-12-02 | 2003-03-25 | Seagate Technology Llc | Micro-textured glide sliders for super-smooth media |
US6552871B2 (en) | 1998-05-21 | 2003-04-22 | Komag, Incorporated | Hard disk drive head-media system having reduced stiction and low fly height |
US6558771B1 (en) | 1999-08-27 | 2003-05-06 | Seagate Technology Llc | Textured magnetic media for use with low-flying padded heads |
US6603639B1 (en) | 1998-07-21 | 2003-08-05 | Seagate Technology Llc | Slider for disc storage system |
US6611400B1 (en) | 1999-01-22 | 2003-08-26 | Seagate Technology Llc | Texture structure for optimizing head disc interface |
US6628598B2 (en) | 2000-12-05 | 2003-09-30 | Imation Corp. | Patterned media system |
US6683754B2 (en) | 1998-05-21 | 2004-01-27 | Komag, Inc. | Hard disk drive head-media system having reduced stiction and low fly height |
US6728196B2 (en) | 1998-04-06 | 2004-04-27 | Imation Corp. | Reverse optical mastering for data storage disks |
US6751060B2 (en) | 2000-12-05 | 2004-06-15 | Imation Corp. | Magnetic media with readable topographical features |
US6754016B2 (en) * | 2001-04-19 | 2004-06-22 | Carnegie Mellon University | Frequency modulation pattern for disk drive assemblies |
US20040240327A1 (en) * | 2003-05-29 | 2004-12-02 | Seagate Technology Llc | Patterned media for heat assisted magnetic recording |
US20050191526A1 (en) * | 2004-02-26 | 2005-09-01 | Tdk Corporation | Magnetic recording medium and magnetic recording and reproducing device |
US20050196650A1 (en) * | 2004-03-03 | 2005-09-08 | Tdk Corporation | Magnetic recording medium |
US20050213482A1 (en) * | 2004-03-24 | 2005-09-29 | Imation Corp. | Multi-track mastering techniques |
US20050213239A1 (en) * | 2004-02-26 | 2005-09-29 | Tdk Corporation | Magnetic recording medium and magnetic recording and reproducing device |
US20060073422A1 (en) * | 2004-09-28 | 2006-04-06 | Imation Corp. | Portable conformable deep ultraviolet master mask |
US20060115773A1 (en) * | 2004-11-29 | 2006-06-01 | Imation Corp. | Anti-reflection optical data storage disk master |
US20060269795A1 (en) * | 2005-05-26 | 2006-11-30 | Kabushiki Kaisha Toshiba | Magnetic recording media |
US7227717B1 (en) * | 2001-06-18 | 2007-06-05 | Seagate Technology Llc | Asymmetric disk surface properties in one head disk drives |
US20070217073A1 (en) * | 2006-03-20 | 2007-09-20 | Samsung Electronics Co., Ltd. | Disk usable with hard disk drive and hard disk drive having the same |
US20080174915A1 (en) * | 2007-01-23 | 2008-07-24 | Seagate Technology Llc | Recordable disc with fluid bearing features |
US20110102940A1 (en) * | 2009-11-02 | 2011-05-05 | Hitachi Global Storage Technologies Netherlands B.V. | System, method and apparatus for planarizing surfaces with functionalized polymers |
US8482880B2 (en) | 2010-10-19 | 2013-07-09 | Hitachi Global Storage Technologies Netherlands B.V. | Patterned structure in a storage media |
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Cited By (71)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5768075A (en) * | 1991-12-17 | 1998-06-16 | Baradun R&D Ltd. | Disk medium w/magnetically filled features aligned in rows and columns |
US6309802B1 (en) | 1991-12-17 | 2001-10-30 | Ronny Bar-Gadda | Disk medium |
US6174597B1 (en) * | 1996-07-26 | 2001-01-16 | Kabushiki Kaisha Toshiba | Magnetic recording apparatus |
US5853959A (en) * | 1996-08-09 | 1998-12-29 | Seagate Technology, Inc. | Method of fabricating a contoured slider surface feature with a single mask |
US6350506B2 (en) | 1996-09-17 | 2002-02-26 | Corning Incorporated | Textured surface and method |
US6180208B1 (en) * | 1997-01-31 | 2001-01-30 | Canon Kabushiki Kaisha | Information recording medium and method for producing the same |
US6454915B1 (en) | 1997-01-31 | 2002-09-24 | Canon Kabushiki Kaisha | Information recording medium and method for producing the same |
US5912791A (en) * | 1997-03-14 | 1999-06-15 | Seagate Technology, Inc. | Landing zone design for a magnetic disc |
US6212042B1 (en) | 1997-06-27 | 2001-04-03 | Seagate Technology Llc | Slider having air bearing surface which includes pads for disk storage system |
US6160683A (en) * | 1997-08-15 | 2000-12-12 | Seagate Technology Llc | Slider for disc storage system |
US6452752B1 (en) | 1997-08-15 | 2002-09-17 | Seagate Technology Llc | Slider for disc storage system |
US6183892B1 (en) * | 1997-09-19 | 2001-02-06 | Mitsubishi Chemical Corporation | Magnetic recording medium substrate and magnetic recording medium |
US6487043B1 (en) | 1997-12-04 | 2002-11-26 | Seagate Technology Llc | Cross texture head disc interface |
US6187413B1 (en) * | 1997-12-05 | 2001-02-13 | Seagate Technology, Llc | Media landing zone with recess for texturing features |
US6403170B2 (en) * | 1997-12-05 | 2002-06-11 | Seagate Technology Llc | Process for texturing recording media substrates |
US6535352B2 (en) | 1997-12-15 | 2003-03-18 | Seagate Technology Llc | Head media interface for stiction control |
US6890704B2 (en) | 1998-04-06 | 2005-05-10 | Imation Corp. | Reverse optical mastering for data storage disks |
USRE44633E1 (en) | 1998-04-06 | 2013-12-10 | Legger Col. A.B. Llc | Reverse optical mastering for data storage disk replicas |
US7352685B2 (en) | 1998-04-06 | 2008-04-01 | Imation Corp. | Reverse optical mastering for data storage disk replicas |
US7600992B2 (en) | 1998-04-06 | 2009-10-13 | Imation Corp. | Reverse optical mastering for data storage disk stamper |
US20100067360A1 (en) * | 1998-04-06 | 2010-03-18 | Edwards Jathan D | Reverse optical mastering for data storage disk replicas |
US7801016B2 (en) | 1998-04-06 | 2010-09-21 | Imation Corp. | Reverse optical mastering for data storage disk replicas |
US7952986B2 (en) | 1998-04-06 | 2011-05-31 | Imation Corp. | Reverse optical mastering for data storage disk replicas |
US7349323B2 (en) | 1998-04-06 | 2008-03-25 | Imation Corp. | Reverse optical mastering for data storage disks |
US20110223369A1 (en) * | 1998-04-06 | 2011-09-15 | Imation Corp. | Reverse Optical Mastering for Data Storage Disk Replicas |
US8363534B2 (en) | 1998-04-06 | 2013-01-29 | Legger Col. A.B. Llc | Reverse optical mastering for data storage disk replicas |
US8705334B2 (en) | 1998-04-06 | 2014-04-22 | Legger Col. A.B. Llc | Replica disk for data storage |
US20040231531A1 (en) * | 1998-04-06 | 2004-11-25 | Edwards Jathan D. | Reverse Optical mastering for data storage disk stamper |
US6728196B2 (en) | 1998-04-06 | 2004-04-27 | Imation Corp. | Reverse optical mastering for data storage disks |
US20040170117A1 (en) * | 1998-04-06 | 2004-09-02 | Edwards Jathan D. | Reverse optical mastering for data storage disk replicas |
US8593931B2 (en) | 1998-04-06 | 2013-11-26 | Legger Col. A.B. Llc | Replica disk for data storage |
US20040170118A1 (en) * | 1998-04-06 | 2004-09-02 | Edwards Jathan D. | Reverse optical mastering for data storage disks |
US6552871B2 (en) | 1998-05-21 | 2003-04-22 | Komag, Incorporated | Hard disk drive head-media system having reduced stiction and low fly height |
US6683754B2 (en) | 1998-05-21 | 2004-01-27 | Komag, Inc. | Hard disk drive head-media system having reduced stiction and low fly height |
US6603639B1 (en) | 1998-07-21 | 2003-08-05 | Seagate Technology Llc | Slider for disc storage system |
US6459547B1 (en) | 1998-12-09 | 2002-10-01 | Seagate Technology Llc | Slider with pads and textured landing zone for disc storage system |
US6335080B1 (en) * | 1999-01-04 | 2002-01-01 | Seagate Technology Llc | Magnetic disk media and disk drives utilizing polymeric disk substrates |
US6611400B1 (en) | 1999-01-22 | 2003-08-26 | Seagate Technology Llc | Texture structure for optimizing head disc interface |
US6495240B1 (en) * | 1999-02-10 | 2002-12-17 | Tdk Corporation | Patterned magnetic recording medium possessing recording portions with a lower height than the surrounding non-magnetic matrix |
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